diff --git a/html/cgi-bin/proxy.cgi b/html/cgi-bin/proxy.cgi
index bdce2fa66..1ade39381 100644
--- a/html/cgi-bin/proxy.cgi
+++ b/html/cgi-bin/proxy.cgi
@@ -3973,6 +3973,7 @@ END
 	{
 		print FILE " $mainsettings{'HOSTNAME'}.$mainsettings{'DOMAINNAME'}\n\n";
 	} else {
+		$proxysettings{'VISIBLE_HOSTNAME'} = &Header::escape($proxysettings{'VISIBLE_HOSTNAME'});
 		print FILE " $proxysettings{'VISIBLE_HOSTNAME'}\n\n";
 	}